Emissions and fuel economy are improved compared to the 2.7-litre HDi it replaces. CO2 emissions are 189g.km, down from 225g/km, and combined fuel economy is 39.2mpg, an improvement of 15 per cent over the 2.7-litre HDi.

The 407 Coupe will be available in the autumn in GT spec, complete with GT-only 19-inch alloy wheels, twin oval exhaust pipes and a rear diffuser.

The 163bhp 2.0-litre HDi, mated to a six speed manual ‘box, is the other new engine added to the range. It is 20 per cent more powerful than the 2.0-litre HDi it replaces, while fuel economy is 52.3mpg and CO2 emissions are 140g/km.

Both new engines will be available in the autumn. Prices are expected to start at around £22,000 for the 2.0-litre HDi and £27,000 for the 3.0-litre HDi in GT spec.